Fix documentation warnings.
Fix documentation warnings.

jhgg/discord.py,mgardne8/discord.py,khazhyk/discord.py,lgkern/PriestPy,Theoretical/UselessBot,Harmon758/discord.py,rapptz/discord.py,variablehair/Eggplantato,Rapptz/discord.py,eartsar/discord.py,megamit/discord.py,Harmon758/discord.py,imayhaveborkedit/discord.py